https://www.phoronix.com/scan.php?page=article&item=3900x-linux-distros&num=1
The above article shows that Debian 10.0 works okay with a third generation Ryzen CPU. I understood that there were problems with Buster using third generation Ryzen. Has this problem been overcome by installing AMD firmware ? Also does the particular BIOS used on the motherboard help to overcome the problem ?